Removable ax-bit.



M'. S. STEWART.

REMOVABLE AX BIT.

APPLICATION man JULY 30. 1911.

1.292531. Patented Jan. 28,1919.

2 SHEETS-SHEET l- M. S. STEWART.

REMOVABLE AX BIT.

APPLICATION EILED JULY 30. 1911.

Patented Jan. 28, 1919.

2 SHEETS-SHEET 2.

MILLETS. STEWART, OF LOWER NEGUAC, NEW BRUNSWICK, CANADA.

REMOVABLE Air-B11.

Specification of Letters Patent.

Patented Jan. 28, 1919.

Application filed July 30, 1917. Serial No. 183,389.

To all whom it may concern:

Be it known that I, MILLET S. STEWART, a subject of the king of Great Britain residing at Lower Neguac, New Brunswick, Canada, have invented new and useful Improvements in Removable AX-Bits, of which the following is a specification.

The invention to be hereinafter described relates to removable ax bits.

In order to more clearly disclose the construction operation, and use of the invention, reference should be had to the accompanying drawings forming part of the present application. Throughout the several figures of the drawings like reference characters designate the same parts in the several views.

In the drawings Figure 1 is a side elevation;

Fig. 2 is a front view;

Fig. 3 is a rear view;

Fig. 4. is a bottom plan view of an ax head;

Fig. 5 is a top plan view of the bit;

Fig. 6 is a central, longitudinal, vertical cross section through the head, showing the bit in position;

Fig. 7 is a side elevation of the head; and,

Fig. 8 is a side elevation of the bit.

The main objects of the invention are to provide a simple, efficient, durable, compact, and economical removable ax bit which may be quickly and readily removed and replaced, together with means for limiting the movement of said bit, relatively to said head, and for preventing the bit from becoming accidentally disengaged from the head.

Referring to the drawings in detail, 1 indicates the head having an arcuate lower end 2 terminating, at the front, in a short straight portion. This end is provided with a channel 3 of egg-shape or ovular lateral cross section, as more clearly shown in Fig. 3. On reference to Figs. 21-5 it will be noticed that the walls of channel 3 taper from front to rear. This is due to the fact that the arc runs downwardly from front to rear, cutting through progressively thinner portions, and, since the channel is of the same cross section throughout, the walls must become thinner, at the rear end. The channel thus formed, leaves two horizontal shoulders 4 at the forward end of each wall 5 of the channel 3, for a purpose to be later disclosed. The cutting edge of the ax is formed on'a removable bit 6, the upper end of which is provided with a tongue, feather, or tenon 7 of a cross section and curvature complementary to that of the channel 3 and having curved walls 8 complementary to the ends of the walls of the channel 3 and terminating in shoulders 9 cooperating with the shoulders 4. The oval shape of the tongue and channel prevent the bit and head from dropping apart. In cutting, the force of the blow tends to drive the bit forward and upward in the direction of the curvature of the walls 5, but the engagement of shoulders 9 on shoulders t prevents this. Consequently, the bit is kept, normally, in exactly the right position. Also, by having the engaging walls 8 and 5 and the channel and tongue on the curvature shown, the force of the blow, as between the removable bit and the head, is distributed. Furthermore, by having the wider or thicker part of the walls 5 and 8 at the front of the head, they are in the proper position to receive the greater part of the force of the stroke.

In assembling the ax head, it is only necessary to slide the tongue-7 into channel 3 and the ax is instantly ready for use.

It is thought that the construction, operation, and use of the invention will be clear from the preceding detailed description. Changes may be made in the construction, arrangement, and disposition of the several parts of the invention, without in any way departing from the field and scope of the invention, and it is meant to include all such within this application wherein only a preferred form has been disclosed, by way of illustration.

Having thus described my invention, what I claim and desire to protect by Letters Patout 15 1. In combination, an ax head having a longitudinally extending, downwardly curved channel running throughout its lower face from front to rear and provided with stop shoulders at the sides of the forward end of the channel, said shoulders being formed by departure from the curve of the bottom of the channel, and a removable bit provided with a cooperating tongue and having cooperating stop shoulders.

2. In combination, a tapered ax head having a downwardly curved channel of uniform oval lateral cross section and running through the head from front to rear and provided with correspondingly curved wall edges increasing in width from rear to front and terminating in stop shoulders formed by departure from the curve of the bottom of the channel; and a removable bit having a cooperating tongue extending from front to rear and provided with cooperating correspondingly curved wall edges increasing in width from rear to front and terminating in cooperating stop shoulders.

Signed at Newcastle, New Brunswick, 10 Canada, this twenty fourth day of July, 1917.

MILLET S. STEWART.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner 1013 Patents, Washington, D. 0." 

